JP2000291301A - Oil master key - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil master key capable of preventing fall of permanent magnets and improving the operating reliability of electromagnetic converting elements. SOLUTION: This oil master key is provided correspondingly to a hatch opening/closing lock for a tank for reserving oil products such as a tank rolly vehicle and has a plurality of permanent magnets 43 arranged for generating electromotive force in only one corresponding to the permanent magnets 43 out of a plurality of electromagnetic converting elements provided on the side of the hatch opening/closing lock and identifying the natural arrangement of the permanent magnets 43 to unlock the hatch opening/closing lock. The permanent magnets 43 are fitted to the magnet mounting face 30 of a key body 23 and a plane cover 47 is mounted to the magnet mounting face 39 to cover the permanent magnets 43. The permanent magnets 43 are provided correspondingly to all electromagnetic converting elements. The plurality of permanent magnets 43 are formed of a main permanent magnet for generating electromotive fore in the electromagnetic converting elements and subsidiary permanent magnets having magnetic poles opposed to the electromagnetic converting elements to be opposite poles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil type key used for specifying an oil type of a plurality of types of petroleum products by combining a magnetoelectric conversion element and a permanent magnet. The present invention relates to an oil type key provided in accordance with a hatch lock and the like in a storage chamber.

[0002]

2. Description of the Related Art For example, a tank truck has a plurality of oil reservoirs for storing different petroleum products such as gasoline, light oil, and kerosene. Each of these sump chambers is provided with a hatch used to supply the corresponding petroleum products. The hatch is locked by a hatch lock, and the hatch lock is unlocked by an oil type key. That is, with the oil type key prepared for each oil type, the oil type key corresponding to the corresponding oil sump chamber is used to specify the oil sump chamber and the petroleum product supplied thereto. Has become.

FIG. 6 is an external perspective view showing a conventional oil type key.
FIG. 7 is a sectional view taken along line AA of FIG. Conventional oil type key 1
The key body 3 is formed in a substantially rectangular plate made of, for example, a synthetic resin. One end of the key body 3 serves as the grip portion 5, and the other end serves as the insertion portion 7. A circumferential groove 5a is formed in the gripping portion 5 to increase the ease of gripping. Further, a magnet mounting plane 9 is formed on the surface of the insertion portion 7 (the upper surface in FIG. 6). The magnet mounting plane 9 is provided with a plurality of recesses 11 arranged at predetermined positions. A permanent magnet 13 is fitted into each of the recesses 11 with an adhesive, and the permanent magnet 13 is attached so that the same magnetic pole (S pole in this example) is exposed and faces the front side.

On the other hand, as shown in FIG.
On the 5th side, a plurality of Hall elements 17 as a plurality of magnetoelectric conversion elements
Are arranged on a plane. When the oil type key 1 is inserted into the hatch lock 15, an electromotive force is generated only in a plurality of Hall elements corresponding to the permanent magnet 13,
These are read as binary signals of “1” or “0”.
As a result, the hatch lock 15 is configured to perform an unlocking operation by identifying the unique arrangement of the permanent magnets 13 in the specific oil type key 1.

[0005]

However, in the conventional oil type key described above, since the permanent magnet is merely fitted into the concave portion by the adhesive, when the fitting strength in the concave portion is reduced, the exposed permanent magnet is exposed. In some cases, the permanent magnet may fall out of the recess due to an external force caused by an object hitting the magnet, an impact applied to the oil type key, or the like. If such a permanent magnet is dropped, the magnetic force does not act on a predetermined Hall element, causing a malfunction of the hatch lock, and the dropped permanent magnet may adversely affect other mechanisms. Was. On the other hand, if the permanent magnet is covered by resin molding, insert molding, etc., the permanent magnet can be prevented from falling off, but the workability of assembling the permanent magnet at the time of assembly is reduced, and maintenance such as replacement of the permanent magnet is difficult. became.

In the conventional oil type key, since the permanent magnet has a strong magnetic force, an adjacent Hall element which does not need to generate an electromotive force is also excited, and there is a possibility that a malfunction occurs in the Hall element. On the other hand, if the magnetic force of the permanent magnet is reduced, the electromotive force generated in a predetermined Hall element is reduced, and the influence of residual magnetism is also combined, which may cause malfunction of the Hall element. .

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide an oil type key which can prevent the permanent magnet from falling off without deteriorating the workability and maintenance of the permanent magnet. Another object of the present invention is to prevent a malfunction of a hatch lock and an adverse effect on other mechanisms due to a dropped permanent magnet.

A second object is to provide an oil type key in which the magnetic force of the permanent magnet acts reliably only on the magnetoelectric conversion element that generates electromotive force, thereby improving the operation reliability of the magnetoelectric conversion element. is there.

[0009]

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The oil type key 21 according to claim 1 of the present invention
A permanent magnet 43 for generating an electromotive force is arranged in the corresponding magnetoelectric conversion element 45, and a recess provided on the magnet mounting surface 39 of the key body 23 in the oil type key 21 for specifying the oil type of a plurality of petroleum products 41, the permanent magnet 43 fitted in the concave portion 41, and a lid 47 attached to the magnet mounting surface 39 and covering the permanent magnet 43.

In this oil type key 21, even if the fitting strength in the recess 41 is reduced, the permanent magnet 43 is
7 prevents the permanent magnet 43 from dropping out of the recess 41, and keeps the permanent magnet 43 held in the recess 41. As a result, a predetermined magnetic force is always obtained, and for example, malfunction of the opening / closing lock 32 is prevented, and adverse effects of the dropped permanent magnet 43 on other mechanisms are also prevented. Further, since the permanent magnet 43 is covered by attaching the cover 47, the workability of incorporating the permanent magnet during assembly does not decrease compared to the case where the permanent magnet 43 is covered by resin molding, insert molding or the like. Furthermore, if the cover 47 is structured to be removable by fixing means such as screws, maintenance such as replacement of permanent magnets is also possible.

An oil type key 2 according to claim 2 of the present invention.
Reference numeral 1 designates a permanent magnet 43 for generating an electromotive force in a corresponding magneto-electric conversion element 45, and an oil type key 21 for specifying an oil type of a plurality of petroleum products. The permanent magnet 43 is provided so as to correspond to
A main permanent magnet 43a for generating an electromotive force, and a sub-permanent magnet 43b other than the main permanent magnet 43a and having a reverse magnetic pole opposite to the magnetoelectric conversion element 45.

In this oil type key 21, a sub-permanent magnet 43
By b, a magnetic force of a polarity opposite to that of the main permanent magnet 43a is generated. Therefore, the remanence and the magnetic force of the main permanent magnet 43a are substantially eliminated from the magnetoelectric conversion element 45 that does not need to generate an electromotive force. As a result, the magnetic force of the main permanent magnet 43a reliably acts only on the magnetoelectric conversion element 45 that generates electromotive force, and there is a risk that the magnetic force will occur when the auxiliary permanent magnet 43b is not provided conventionally. Adjacent magneto-electric conversion element 45 due to magnetic interference of magnet 43a
Will be prevented from malfunctioning.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an oil type key according to the present invention will be described below in detail with reference to the drawings. FIG.
1 is an exploded perspective view of the oil type key according to the present invention, FIG. 2 is a plan view of the oil type key of FIG. 1 viewed from the front side, FIG. 3 is a longitudinal sectional view of the oil type key of FIG. FIG. 5 is an explanatory view showing a magnetic force generated by a permanent magnet provided in the oil type key of FIG. 1. The lock using the oil type key 21 in the present embodiment will be described by taking, as an example in the related art, an opening / closing lock 32 in a tank having an oil reservoir for storing petroleum products.

The oil type key 21 according to the present embodiment is shown in FIG.
As shown in (1), the key body 23 is formed in a substantially rectangular plate made of, for example, a synthetic resin. One end of the key body 23 serves as the holding portion 25, and the other end serves as the insertion portion 27. A circumferential groove 25a is formed in the grip 25 so as to increase the ease of gripping.

A hollow portion 29 shown in FIG. 3 is formed inside the grip portion 25, and the hollow portion 29 is open on the back surface of the grip portion 25 (downward in FIG. 3). This cavity 29
Reduces the volume of the gripping portion 25 to reduce the weight of the oil type key 21, facilitates the recognition of the front and back sides during operation, and further functions as a non-slip when the oil type key 21 is removed and inserted. .

On the surface (upper surface in FIG. 1) of the insertion portion 27, there is formed a lid fitting portion 37 formed by recessing most of the surface area. The bottom surface of the lid fitting portion 37 is a flat magnet mounting surface 39.

The magnet mounting surface 39 is provided with a plurality of substantially rectangular recesses 41 arranged at predetermined positions. A substantially rectangular permanent magnet 43 is fitted into each of the concave portions 41 by an adhesive.

A projection 31 shown in FIG. 3 is provided near the tip of the back surface of the insertion portion 27.

On the other hand, the hatch lock 32 shown in FIG. 5, which is a lock using the oil type key 21, has a key insertion portion 33 in which the insertion portion 27 of the oil type key 21 can be inserted. The key insertion portion 33 is formed with a guide groove 35 that allows the projection 31 to enter.

The insertion portion 27 can be inserted into the key insertion portion 33 by causing the projection 31 to enter the guide groove 35. That is, the protrusion 31 and the guide groove 35
Regulates the insertion direction of the front and back of the oil type key 21 so that the oil type key 21 is inserted in a predetermined direction.

As shown in FIG. 5, in the hatch lock 32, a plurality of Hall elements 45 as a plurality of magnetoelectric conversion elements are arranged on a plane. Each permanent magnet 43 of the oil type key 21 described above is provided so as to correspond to all of these Hall elements 45.

Hereinafter, of the plurality of permanent magnets 43, a permanent magnet 43 for generating an electromotive force in the Hall element 45 will be described.
Is referred to as a main permanent magnet 43a, and the permanent magnets 43 other than the main permanent magnet 43a are referred to as sub-permanent magnets 43b.

The main permanent magnet 43a and the sub permanent magnet 4
3b is attached such that the magnetic pole facing the Hall element 45 is the opposite pole. In this embodiment, the Hall element 45 is set to sense the S pole, the main permanent magnet 43a has the S pole facing the Hall element 45, and the sub permanent magnet 43b has the N pole facing the Hall element 45. .

When a bias current is applied to the Hall element 45 disposed on the hatch lock 32 and a magnetic force is applied in a direction perpendicular to the bias current, an electromotive force is generated perpendicular to both the bias current and the magnetic force. Let it. In this embodiment, a magnetic force is applied to the Hall element 45 by the main permanent magnet 43a. That is, the leader of the hatch lock 32 generates an electromotive force only in the permanent magnet 43 facing the main element 43a among the permanent magnets 43 facing the Hall element 45, and generates an electromotive force of "1" or "0". Read as a value signal. Thus, the hatch lock 32 identifies the unique arrangement of the main permanent magnet 43a in the specific oil type key 21 and performs the unlocking operation.

As shown in FIG. 1, the lid fitting portion 37 on which the permanent magnet 43 is fitted, as shown in FIG.
7 is mounted parallel to the magnet mounting surface 39. The magnet mounting surface 39 has a plurality of fixing holes 49 penetrating the insertion portion 27. The cover 47 is provided with a plurality of fixing rods 51 corresponding to these fixing holes 49. The fixed rod 51 is formed integrally with the lid 47 by, for example, a synthetic resin.

Then, the cover 47 is inserted into the fixing hole 49 by the fixing rod 51 and, as shown in FIG. Fixed to That is, the permanent magnet 43 is
It is covered by and is not exposed.

The cover 47 is provided with a resin bolt instead of the fixed rod 51, and a resin nut is screwed onto the resin bolt having the insertion portion 27 penetrated therethrough, so that the cover can be removably fitted. It may be fixed to the part 37.

Further, a plurality of elastic locking claws are projected from the lid 47, and a locking portion for locking the elastic locking claws is provided on the lid fitting portion 37. The lid 47 may be fixed to the lid fitting portion 37 by locking the locking portion. Also in this case, by providing an unlocking hole for deforming the elastic locking claw piece by a jig or the like, the locking between the elastic locking claw piece and the locking portion can be released, and the lid 47 can be released.
Can be detachably fixed to the lid fitting portion 37. If the lid 47 and the lid fitting portion 37 have such a detachable structure, maintenance such as replacement of the permanent magnet 43 can be made possible.

Next, the oil type key 21 constructed as described above is used.
The operation of will be described. In this oil type key 21, the permanent magnet 43 is supported by the lid 47 even when the fitting strength in the concave portion 41 is reduced. Therefore, even when the adhesive force of the adhesive is lost, the permanent magnet 43
Dropping from the concave portion 41 is prevented, and the state of being held in the concave portion 41 is maintained. As a result, a predetermined magnetic force is always obtained, and the malfunction of the hatch lock 32 is prevented, and the adverse effect of the dropped permanent magnet 43 on other mechanisms is also prevented.

Further, since the permanent magnet 43 is covered by attaching the cover 47, the workability of assembling the permanent magnet 43 at the time of assembly is reduced as compared with the case where the permanent magnet 43 is covered by resin molding, insert molding or the like. You don't have to. Furthermore, if the lid 47 is configured to be removable using fixing means such as screws, maintenance such as replacement of the permanent magnet 43 becomes possible.

In the oil type key 21, a magnetic force of a polarity opposite to that of the main permanent magnet 43a is generated by the sub-permanent magnet 43b to the Hall element 45 which does not need to generate an electromotive force. Accordingly, the residual magnetism and the magnetic force of the main permanent magnet 43a are substantially eliminated from the Hall element 45 which does not need to generate an electromotive force. This allows
The magnetic force of the main permanent magnet 43a reliably acts only on the Hall element 45 that generates the electromotive force, and conventionally, when the auxiliary permanent magnet 43b is not provided, there is a concern that the magnetic force of the main permanent magnet 43a may be generated. Adjacent Hall element 45 due to magnetic interference
Will be prevented from malfunctioning.

In the above embodiment, the oil type key 21 has been described as an example in which the oil type key 21 is used as the open / close lock 32 provided in the hatch of the oil reservoir. It may be used to sort the oil type used at the time of, for example, when unloading petroleum products from a tank truck, the type of storage tank on the receiving side and the type of petroleum product to be unloaded May be used to perform matching for matching. That is, the oil type key of the present invention may be any of the above-described key types as long as the key is used when discriminating the oil type at the time of loading or unloading the petroleum product in a strictly prohibited area for handling petroleum products. It is not limited to the embodiment.

[0033]

As described in detail above, in the oil type key according to the first aspect of the present invention, the cover is attached to the magnet attachment surface of the key body to cover the permanent magnet fitted in the recess. Even when the fitting strength in the concave portion is reduced, the permanent magnet is prevented from falling off by the lid, and the state where the permanent magnet is held in the concave portion can be maintained. As a result, it is possible to prevent, for example, a malfunction of the opening / closing lock of the tank and an adverse effect on other mechanisms due to the dropped permanent magnet.

Also, since the permanent magnet is covered by attaching the lid, the workability of assembling the permanent magnet at the time of assembling does not decrease and the maintenance becomes possible as compared with the case where the permanent magnet is covered by resin molding, insert molding or the like. Can be.

In the oil type key according to the present invention, the plurality of permanent magnets may include a main permanent magnet for generating an electromotive force in the magnetoelectric conversion element, and a magnetic pole opposed to the magnetoelectric conversion element having a reverse polarity. For the magnetoelectric conversion element that does not need to generate an electromotive force, the sub-permanent magnet generates a magnetic force of the opposite polarity to that of the main permanent magnet. Is erased. As a result, the magnetic force of the main permanent magnet reliably acts only on the magneto-electric conversion element that generates the electromotive force, and conventionally, the magneto-electric conversion element due to magnetic interference that may be generated when the auxiliary permanent magnet is not provided. Can be prevented, and the operation reliability of the magnetoelectric conversion element can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an oil type key according to the present invention.

FIG. 2 is a plan view of the oil type key of FIG. 1 as viewed from the front side.

FIG. 3 is a vertical sectional view of the oil type key of FIG. 1;

FIG. 4 is a plan view of the oil type key of FIG. 1 as viewed from the back side.

FIG. 5 is an explanatory diagram showing a magnetic force generated by a permanent magnet provided on the oil type key of FIG. 1;

FIG. 6 is an external perspective view of a conventional oil type key.

FIG. 7 is a cross-sectional view of a recess in which a permanent magnet is fitted in a conventional oil type key insertion portion.

FIG. 8 is an explanatory diagram showing a magnetic force generated by a permanent magnet provided in a conventional oil type key.

[Explanation of symbols]

 Reference Signs List 21 oil type key 23 key body 39 magnet mounting surface 41 recess 43 permanent magnet 43a main permanent magnet 43b sub-permanent magnet 45 magnetoelectric conversion element 47 lid

Claims (2)

[Claims] 1. An oil type key for specifying an oil type of a plurality of types of petroleum products, wherein a permanent magnet for generating an electromotive force is arranged in a corresponding magnetoelectric conversion element. An oil type key comprising: a permanent magnet fitted into the concave portion; and a lid attached to the magnet mounting surface and covering the permanent magnet. 2. An oil type key for specifying an oil type of a plurality of petroleum products, wherein a permanent magnet for generating an electromotive force is arranged in a corresponding magnetoelectric conversion element. And a main permanent magnet of the plurality of permanent magnets for generating an electromotive force in the magneto-electric conversion element, and a sub-magnet other than the main permanent magnet and having a magnetic pole opposite to the magneto-electric conversion element opposite in polarity. An oil type key comprising: a permanent magnet;